Adapter assemblies for interconnecting surgical loading units and handle assemblies

ABSTRACT

An adapter assembly configured to be coupled to a surgical loading unit includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the surgical loading unit being coupled to the adapter assembly. The elongated member is in communication with the switch and is resiliently biased in a distal direction toward a locking position in which the switch is toggled. The annular member is disposed adjacent the elongated member and is rotatable between a first orientation, in which the annular member prevents distal movement of the elongated member, and a second orientation, in which the elongated member moves distally to toggle the switch.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application of U.S. patent application Ser. No. 14/672,579, filed on Mar. 30, 2015, which claims the benefit of and priority to U.S. Provisional Patent Application Ser. No. 62/017,581, filed on Jun. 26, 2014, the entire contents of each of which being incorporated by reference herein.

BACKGROUND 1. Technical Field

The present disclosure relates to adapter assemblies for use with an electromechanical surgical system and their methods of use. More specifically, the present disclosure relates to hand-held, electromechanical surgical instruments capable of detecting a presence of a loading unit and/or identifying one or more parameters of a loading unit attached to an adapter assembly.

2. Background of Related Art

Linear clamping, cutting, and stapling surgical devices may be employed in surgical procedures to resect tissue. Conventional linear clamping, cutting, and stapling devices include a handle assembly, an elongated shaft and a distal portion. The distal portion includes a pair of scissors-styled gripping members, which clamp about the tissue. In this device, one or both of the two scissors-styled gripping members, such as the anvil portion, moves or pivots relative to the overall structure. The actuation of this scissoring device may be controlled by a grip trigger maintained in the handle.

In addition to the scissoring device, the distal portion may also include a stapling mechanism. One of the gripping members of the scissoring mechanism includes a staple cartridge receiving region and a mechanism for driving the staples up through the clamped end of the tissue against the anvil portion, thereby sealing the previously opened end. The scissoring elements may be integrally formed with the shaft or may be detachable such that various scissoring and stapling elements may be interchangeable.

A number of surgical device manufacturers have developed product lines with proprietary drive systems for operating and/or manipulating the surgical device. In many instances the surgical devices include a reusable handle assembly and a disposable loading unit or the like that is selectively coupled to the handle assembly prior to use and then disconnected from the handle assembly following use in order to be disposed of or in some instances sterilized for re-use.

A need exists for various types of adapter assemblies that communicate relevant information to a handle assembly upon a proper engagement of a loading unit with a handle assembly.

SUMMARY

The present disclosure relates to adapter assemblies for use between handle assemblies and loading units. The present disclosure also relates to mechanisms for toggling a switch of an adapter assembly for effectively communicating information about a loading unit to a handle assembly, which is coupled to the adapter assembly, upon engagement of the loading unit with the handle assembly.

According to an aspect of the present disclosure, an adapter assembly is provided. The adapter assembly is configured to be coupled to a surgical loading unit. The adapter assembly includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the surgical loading unit being coupled to the adapter assembly. The elongated member is in communication with the switch and is resiliently biased in a distal direction toward a locking position in which the switch is toggled. The annular member is disposed adjacent the elongated member and is rotatable between a first orientation, in which the annular member prevents distal movement of the elongated member, and a second orientation, in which the elongated member moves distally to toggle the switch.

In embodiments, the annular member may be resiliently biased toward the first orientation such that the annular member rotates to the first orientation upon a decoupling of the loading unit from the adapter assembly. The adapter assembly may further include a biasing member engaged to the annular member. The biasing member may be configured to resist rotation of the annular member from the first orientation to the second orientation. It is contemplated that the biasing member may be a leaf spring having a fixed proximal end and a distal end in engagement with the annular member. A rotation of the annular member may pivot the leaf spring about the proximal end thereof.

In embodiments, the annular member may include at least one appendage configured to abut the loading unit upon coupling the loading unit with the adapter assembly. The at least one appendage may include a first tab circumferentially disposed on the annular member and a second tab circumferentially disposed on the annular member and radially spaced from the first tab. The first tab may be engaged with a distal end of the elongated member when the annular member is in the first orientation.

In embodiments, a proximal end of the elongated member may include a ring member configured to toggle the switch when the elongated member is in the locking position. The ring member may be proximal of the switch and not engaged therewith when the elongated member is in a non-locking position.

In embodiments, the adapter assembly may further include an inner housing and an actuator board. The inner housing has a proximal end and the elongated member has a proximal end disposed around the proximal end of the inner housing. The switch may be disposed within the proximal end of the inner housing. The actuator board may be attached to the proximal end of the inner housing and extend proximally therefrom and overlap the switch. The actuator board may be resiliently biased toward a position in which the actuator board is spaced from the switch. The proximal end of the elongated member biases the actuator board into engagement with the switch upon movement of the elongated member to the locking position.

In another aspect of the present disclosure, a surgical instrument is provided. The surgical instrument includes a surgical loading unit and an adapter assembly. The loading unit has a proximal end including at least one protrusion. The adapter assembly has a proximal end configured to be coupled to a handle assembly and a distal end configured to be coupled to the proximal end of the loading unit. The adapter assembly includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the loading unit being coupled to the distal end of the adapter assembly. The elongated member has a proximal end in communication with the switch and a distal end. The elongated member is resiliently biased in a distal direction away from a non-locking position and toward a locking position in which the switch is toggled. The annular member is disposed adjacent the distal end of the elongated member and includes at least one appendage configured to abut the at least one protrusion of the loading unit upon coupling the loading unit with the adapter assembly. The annular member is rotatable between a first orientation, in which the at least one appendage is engaged to the distal end of the elongated member to maintain the elongated member in the non-locking position and a second orientation, in which the at least one appendage is disengaged from the distal end of the elongated member such that the elongated member moves to the locking position to toggle the switch.

In embodiments, the annular member may be resiliently biased toward the first orientation such that the annular member rotates to the first orientation upon a decoupling of the loading unit from the adapter assembly. The adapter assembly may further include a biasing member engaged to the annular member and may be configured to resist rotation of the annular member from the first orientation to the second orientation. The biasing member may be a leaf spring having a proximal end fixed to the adapter assembly and a distal end in engagement with the annular member. A rotation of the annular member pivots the leaf spring about the proximal end thereof.

In embodiments, in the locking position, the at least one protrusion is captured between the at least one appendage and the distal end of the elongated member such that the loading unit is lockingly engaged to the adapter assembly.

In embodiments, the at least one appendage may include a first tab circumferentially disposed on the annular member and a second tab circumferentially disposed on the annular member and radially spaced from the first tab. The first tab engages with the distal end of the elongated member when the annular member is in the first orientation. The at least one protrusion may include a first protrusion and a second protrusion radially spaced from the first protrusion. Upon coupling of the loading unit with the adapter assembly the first tab engages the first protrusion and the second tab engages the second protrusion.

In embodiments, the proximal end of the elongated member includes a ring member configured to toggle the switch when the elongated member is in the locking position. The ring member may be engaged with the switch when the elongated member is in the locking position and the ring member may be proximal of the switch and not engaged therewith when the elongated member is in the non-locking position.

In yet another aspect of the present disclosure, another embodiment of a surgical instrument is provided. The surgical instrument includes a handle assembly, a surgical loading unit, and an adapter assembly. The surgical loading unit has a proximal end including at least one protrusion. The adapter assembly has a proximal end configured to be coupled to the handle assembly and a distal end configured to be coupled to the proximal end of the loading unit. The adapter assembly includes a switch, an elongated member, and an annular member. The switch is configured to be toggled in response to the loading unit being coupled to the distal end of the adapter assembly. The switch is electrically connected with the handle assembly such that upon engagement of the loading unit with the adapter assembly the switch communicates to the handle assembly at least one of an indicator that the loading unit is coupled to the adapter assembly or at least one parameter pertaining to the loading unit. The elongated member has a proximal end in communication with the switch and a distal end. The elongated member is resiliently biased in a distal direction away from a non-locking position and toward a locking position in which the switch is toggled. The annular member is disposed adjacent the distal end of the elongated member and includes at least one appendage configured to abut the at least one protrusion of the loading unit upon coupling the loading unit with the adapter assembly. The annular member is rotatable between a first orientation, in which the at least one appendage is engaged to the distal end of the elongated member to maintain the elongated member in the non-locking position and a second orientation, in which the at least one appendage is disengaged from the distal end of the elongated member such that the elongated member moves to the locking position to toggle the switch.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present disclosure are described herein with reference to the accompanying drawings, wherein:

FIG. 1A is a perspective view of a hand-held, electromechanical surgical instrument, in accordance with an embodiment of the present disclosure;

FIG. 1B is a perspective view of an embodiment of an adapter assembly of the surgical instrument shown in FIG. 1A;

FIG. 1C is a side view of a surgical loading unit of the surgical instrument shown in FIG. 1A, including an end effector attached thereto;

FIG. 2A is an enlarged operational view of a proximal portion of the adapter assembly shown in FIG. 1B and a switch thereof in a non-actuated state;

FIG. 2B is an enlarged operational view of the proximal portion of the adapter assembly shown in FIG. 1B and the switch thereof in an actuated state;

FIG. 3A is an enlarged operational view of a distal portion of the adapter assembly shown in FIG. 1B, without a loading unit engaged therewith;

FIG. 3B is an enlarged operational view of the distal portion of the adapter assembly shown in FIG. 1B coupled with the loading unit shown in FIG. 1C;

FIG. 4 is a perspective view of an annular member of the adapter assembly shown in FIG. 3A;

FIG. 5A is an enlarged operational view of the distal portion of the adapter assembly shown in FIG. 1B lockingly engaged with the loading unit shown in FIG. 1C;

FIG. 5B is an enlarged operational view of the distal portion of the adapter assembly shown in FIG. 1B non-lockingly engaged with the loading unit shown in FIG. 1C;

FIG. 6A is an enlarged operational view of the distal portion of the adapter assembly shown in FIG. 1B engaged with the loading unit of FIG. 1C, illustrating the annular member and a biasing member in a first orientation;

FIG. 6B is an enlarged operational view of the distal portion of the adapter assembly shown in FIG. 1B engaged with the loading unit of FIG. 1C, illustrating the annular member and the biasing member in a second orientation;

FIGS. 7A and 7B are alternate enlarged operational views of a proximal portion of an alternative embodiment of an adapter assembly in accordance with the principles of the present disclosure; and

FIGS. 8A and 8B are alternate enlarged operational views of a proximal portion of another alternative embodiment of an adapter assembly in accordance with the principles of the present disclosure.

DETAILED DESCRIPTION

Embodiments of the presently disclosed surgical instruments, surgical loading units, and adapter assemblies for electromechanical surgical devices and/or handle assemblies are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views. As used herein the term “distal” refers to that portion of the surgical instrument, adapter assembly, handle assembly, loading unit or components thereof, farther from the user, while the term “proximal” refers to that portion of the surgical instrument, adapter assembly, handle assembly, loading unit or components thereof, closer to the user. As used herein, the term “toggle” is defined as a transition between a first condition, in which a switch is engaged, and a second condition, in which the switch is disengaged.

With reference to FIGS. 1A-1C, a surgical instrument, in accordance with an embodiment of the present disclosure, is generally designated as 10, and is in the form of a powered, hand-held, electromechanical surgical instrument configured for selective attachment thereto with any one of a number of adapter assemblies 200, and, in turn, each unique adapter assembly 200 is configured for selective connection with any number of surgical loading units 300. Loading unit 300 and adapter assembly 200 are configured for actuation and manipulation by a handle assembly 100.

Reference may be made to International Publication No. WO 2009/039506 and U.S. Patent Application Publication No. 2011/0121049, the entire contents of all of which are incorporated herein by reference, for a detailed description of the construction and operation of an exemplary electromechanical, hand-held, powered surgical instrument.

Handle assembly 100 includes one or more controllers (not shown), a power source (not shown), a processor 104, and a drive mechanism having one or more motors 106, gear selector boxes (not shown), gearing mechanisms (not shown), and the like. Processor 104 is configured to control motors 106 and to detect a presence of a loading unit, for example, loading unit 300, and/or determine one or more parameters of loading unit 300, as described herein. Handle assembly 100 further includes a control assembly 108. Control assembly 108 may include one or more finger-actuated control buttons, rocker devices, joystick or other directional controls, whose input is transferred to the drive mechanism to actuate adapter assembly 200 and loading unit 300.

In particular, with reference to FIG. 1C, the drive mechanism is configured to drive shafts and/or gear components in order to selectively move an end effector 304 of loading unit 300 to rotate end effector 304 about a longitudinal axis “X” defined by surgical instrument 10 relative to handle assembly 100, to move an anvil assembly 306 relative to a cartridge assembly 308 of end effector 304, and/or to fire a stapling and cutting cartridge within cartridge assembly 308 of end effector 304.

With continued reference to FIG. 1A, handle assembly 100 defines a nose or connecting portion 110 configured to accept a corresponding drive coupling assembly 210 (FIG. 1B) of adapter assembly 200. Connecting portion 110 of handle assembly 100 has a cylindrical recess (not shown) that receives drive coupling assembly 210 of adapter assembly 200 when adapter assembly 200 is mated to handle assembly 100. Connecting portion 110 houses one or more rotatable drive connectors (not shown) that interface with corresponding rotatable connector sleeves of adapter assembly 200.

When adapter assembly 200 is mated to handle assembly 100, each of the rotatable drive connectors of handle assembly 100 couples with a corresponding rotatable connector sleeve of adapter assembly 200. In this regard, the interface between the plurality of drive connectors of handle assembly 100 and the plurality of corresponding connector sleeves of the adapter assembly are keyed such that rotation of each of the drive connectors causes rotation of the corresponding connector sleeves of adapter assembly 200.

The mating of the drive connectors of handle assembly 100 with the connector sleeves of adapter assembly 200 allows rotational forces to be independently transmitted via each of the three respective connector interfaces. The drive connectors of handle assembly 100 are configured to be independently rotated by the drive mechanism.

Since each of the drive connectors of handle assembly 100 has a keyed and/or substantially non-rotatable interface with the respective connector sleeves of adapter assembly 200, when adapter assembly 200 is coupled to handle assembly 100, rotational force(s) are selectively transferred from drive mechanism of handle assembly 100 to adapter assembly 200.

With continued reference to FIGS. 1A-1C, the selective rotation of drive connector(s) of handle assembly 100 allows surgical instrument 10 to selectively actuate different functions of end effector 304. Selective and independent rotation of first drive connector of handle assembly 100 corresponds to the selective and independent opening and closing of end effector 304, and driving of a stapling/cutting component of end effector 304. Also, the selective and independent rotation of second drive connector of handle assembly 100 corresponds to the selective and independent articulation of end effector 304 about an articulation axis that is transverse to longitudinal axis “X.” In particular, end effector 304 defines a second or respective longitudinal axis and is movable from a first position in which the second or respective longitudinal axis is substantially aligned with longitudinal axis “X” to at least a second position in which the second longitudinal axis is disposed at a non-zero angle with respect to longitudinal axis “X.” Additionally, the selective and independent rotation of the third drive connector of handle assembly 100 corresponds to the selective and independent rotation of loading unit 300 about longitudinal axis “X” relative to handle assembly 100 of surgical instrument 10.

With continued reference to FIGS. 1A and 1B, adapter assembly 200 includes a knob housing 202 and an elongated body 204 extending from a distal end of knob housing 202. Knob housing 202 and elongated body 204 are configured and dimensioned to house the components of adapter assembly 200. Elongated body 204 is dimensioned for endoscopic insertion. For example, elongated body 204 is passable through a typical trocar port, cannula or the like. Knob housing 202 is dimensioned to not enter the trocar port, cannula of the like. Knob housing 202 includes a button 203 coupled to a switch 220 of adapter assembly 200, as described in greater detail below.

Elongated body 204 of adapter assembly 200 has a proximal portion 206 a coupled to knob housing 202 and a distal portion 206 b configured to be coupled to loading unit 300. Elongated body 204 includes a cylindrical outer housing 212 and a cylindrical inner housing 214 (FIGS. 2A, 2B) disposed within outer housing 212. Elongated body 204 further includes a distal cap 208 extending distally from distal portion 206 b.

With reference to FIG. 1C, coupling and decoupling of loading unit 300 is described. Loading unit 300 has a proximal portion 302 a configured for engagement with distal end 206 b of elongated body 204 of adapter assembly 200 and a distal portion 302 b. Proximal portion 302 a is sized and dimensioned to be inserted through distal cap 208 to lockingly engage adapter assembly 200 with loading unit 300. Proximal portion 302 a includes a first protrusion or first lug 312 a and a second protrusion or second lug 312 b radially spaced from one another. Lugs 312 a, 312 b are each disposed on an outer surface of proximal portion 302 a. Lugs 312 a, 312 b have a substantially rectangular cross-section. In embodiments, lugs 312 a, 312 b may be variously configured, such as, for example, those alternatives described herein. Upon coupling loading unit 300 with adapter assembly 200, lugs 312 a, 312 b engage or interface with tabs 268 a, 268 b of annular member, respectively, as described in greater detail below.

Distal portion 302 b of loading unit 300 has an end effector 304 extending therefrom. End effector 304 is pivotally attached to distal portion 302 b. End effector 304 includes an anvil assembly 306 and a cartridge assembly 308. Cartridge assembly 308 is pivotable in relation to anvil assembly 306 and is movable between an open or unclamped position and a closed or clamped position for insertion through a cannula of a trocar.

Reference may be made to U.S. Pat. No. 7,819,896, filed on Aug. 31, 2009, entitled “TOOL ASSEMBLY FOR A SURGICAL STAPLING DEVICE”, the entire content of which is incorporated herein by reference, for a detailed discussion of the construction and operation of an end effector.

With reference to FIGS. 2A-6B, adapter assembly 200 further includes a switch 220, an elongated member or locking bar 240, an annular member 260, and a biasing member 280, each being disposed within elongated body 204 of adapter assembly 200. With specific reference to FIGS. 2A and 2B, switch 220 is toggled by a switch actuator or ring member 244 in response to a coupling of loading unit 300 to distal portion 206 b of elongated body 204 as described in detail below. Switch 220 is disposed on or within inner housing 214, adjacent knob housing 202. Switch 220 is mounted on a printed circuit board 222 that is electrically connected to processor 104 of handle assembly 100 via electrical wires “W” and/or any other suitable connections, e.g., wireless communication. Upon toggling of switch 220, switch 220 communicates to handle assembly 100 that loading unit 300 is lockingly engaged to distal portion 206 b of elongated body 204 or that loading unit 300 is disengaged from distal portion 206 b of elongated body 204, as described in further detail below.

With continued reference to FIGS. 2A and 2B, as mentioned above, adapter assembly 200 includes locking bar 240. Locking bar 240 is slidingly disposed within or along inner housing 214 of elongated body 204. Locking bar 240 is longitudinally movable between a proximal position or non-locking position, as shown in FIGS. 2A, 3A, 3B, and 5B, and a distal position or locking position, as shown in FIGS. 2B and 5A. Locking bar 240 toggles switch 220 during movement between the proximal/non-locking position and the distal/locking position. In embodiments, locking bar 240 may toggle switch 220 when in the distal/locking position or the proximal/non-locking position.

Locking bar 240 has a proximal end portion 242 a disposed within knob housing 202 and a distal end portion 242 b (see FIGS. 3A, 3B, 5A, and 5B) disposed within distal portion 206 b of elongated body 204. Proximal end portion 242 a includes ring member 244 configured to toggle switch 220 when locking bar 240 is in the distal/locking position. Ring member 244 encircles a proximal end 214 a of inner housing 214 and is slidingly disposed therewith. Ring member 244 includes a fin 246 coupled to button 203 of knob housing 202, such that an actuation of button 203 results in a concomitant movement of locking bar 240.

In use, as locking bar 240 translates along longitudinal axis “X” (see FIG. 1A) from the proximal/non-locking position, as shown in FIGS. 2A, 3A, 3B, and 5B, to the distal/locking position, as shown in FIGS. 2B and 5A, ring member 244 of locking bar 240 toggles switch 220 by engaging switch 220. In embodiments, ring member 244 may include a projection (not shown) configured to engage switch 220 when locking bar 240 is in the distal/locking position. In some embodiments, ring member 244 actuates or depresses switch 220 when locking bar 240 is in the proximal/non-locking position and disengages switch 220 upon movement from the proximal/non-locking position to the distal/locking position depending on the location and orientation of switch 220.

With reference to FIGS. 3A and 3B, distal end portion 242 b of locking bar 240 includes an extension 252 having a tapered portion 252 a. Distal end portion 242 b of locking bar 240 further includes a cutout portion 254 configured to accommodate a first lug 312 a of loading unit 300 (see FIG. 5A), as described in greater detail below. Locking bar 240 further includes a biasing member, e.g., a coil spring 255 that resiliently biases locking bar 240 toward the distal/locking position, in which ring member 244 of locking bar 240 actuates or depresses switch 220.

With reference to FIGS. 3A-5B, adapter assembly 200 includes annular member 260, which is rotatably disposed between a distal end 214 b of inner housing 214 and distal cap 208 of elongated body 204. Annular member 260 includes a ring body 262 having a substantially planar configuration. Ring body 262 defines a cylindrical passageway 264 therethrough configured for disposal of loading unit 300. It is contemplated that a portion or portions of annular member 260 may be ring-shaped or that all of annular member 260 may be ring-shaped. Ring body 262 defines a groove or notch 266 in an outer surface thereof configured to capture a distal end 282 b of leaf spring 280 (see FIGS. 6A and 6B) therein, as described in greater detail below.

Annular member 260 further includes a first appendage or tab 268 a and a second appendage or tab 268 b, each extending perpendicularly from ring body 262. Tabs 268 a, 268 b are circumferentially disposed on ring body 262 and radially spaced from one another along the outer surface of ring body 262. First tab 268 a of annular member 260 abuts extension 252 of locking bar 240 to maintain locking bar 240 in the proximal/non-locking position, as shown in FIGS. 3A and 3B. First tab 268 a of annular member 260 is configured to interface or engage with a first protrusion or first lug 312 a (FIGS. 3B, 5A, and 5B) of loading unit 300 upon coupling loading unit 300 with adapter assembly 200, such that annular member 260 is rotatable by and with loading unit 300.

Annular member 260 is rotatable between a first orientation and a second orientation. In the first orientation, as shown in FIGS. 3A and 3B, first tab 268 a of annular member 260 engages extension 252 of locking bar 240. First tab 268 a prevents distal movement of locking bar 240 from the proximal/non-locking position to the distal/locking position, thereby maintaining ring member 244 of locking bar 240 out of engagement with switch 220. Accordingly, first tab 268 a of annular member 260 maintains locking bar 240 in the proximal/non-locking position, out of engagement with switch 220, and also provides an interface between loading unit 300 and annular member 260.

In the second orientation, as shown in FIGS. 5A and 5B, first tab 268 a of annular member 260 is disengaged from extension 252 of locking bar 240 thereby permitting locking bar 240 to move distally to toggle switch 220.

With reference to FIGS. 6A and 6B, an opposite radial side of adapter assembly 200 is shown. Adapter assembly 200 further includes a biasing member, e.g., leaf spring 280. Leaf spring 280 is disposed in a cavity 215 defined in distal end 214 b of inner housing 214 of elongated body 204. Cavity 215 has a substantially triangular configuration. In embodiments, cavity 215 may be of any suitable shape for housing the lead spring 280, such as, for example, arcuate, oblong, squared, oval, tapered, uniform, non-uniform, and/or polygonal. Leaf spring 280 has a proximal end 282 a and a distal end 282 b. Proximal end 282 a has a bent portion or tang 284 fixed in a correspondingly shaped channel 215 a of cavity 215. Distal end 282 b is disposed in notch 266 of annular member 260. Distal end 282 b is pivotable about proximal end 282 a to sweep across cavity 215 upon rotation of annular member 260 between the first and second orientations. The resilient bias of leaf spring 280 resists and/or prevents annular member 260 from rotating from the first orientation to the second orientation. In this way, leaf spring 280 maintains first tab 268 a of annular member 260 in abutment with extension 252 of locking bar 240, thereby maintaining locking bar 240 in the proximal/non-locking position, out of engagement with switch 220, until loading unit 300 is engaged to adapter assembly 200.

In operation, with reference to FIGS. 3B, and 5A-6B, loading unit 300 is inserted within distal cap 208 of elongated body 204 to abut first lug 312 a of loading unit 300 with first tab 268 a of annular member 260, as shown in FIG. 3B. Loading unit 300 is then rotated, in a direction indicated by arrow “A” in FIG. 3B, to overcome the resilient bias of leaf spring 280 thereby rotating annular member 260 from the first orientation to the second orientation. Rotation of annular member 260 from the first orientation to the second orientation disengages first tab 268 a of annular member 260 from extension 252 of locking bar 240 such that the distally-oriented bias of locking bar 240 moves locking bar 240, in the direction indicated by arrow “B” in FIG. 5A, toward the distal/locking position. In the distal/locking position, first lug 312 a of loading unit 300 is captured in an enclosure 284 defined by extension 252 of locking bar 240, first tab 268 a of annular member 260, and distal cap 208, thereby preventing loading unit 300 from decoupling from adapter assembly 200.

In the distal/locking position, ring member 244 of locking bar 240 is in engagement with switch 220 to toggle switch 220, as shown in FIG. 2B. When switch 220 is toggled, switch 220 communicates to handle assembly 100 an indicator that loading unit 300 is lockingly engaged to adapter assembly 200 and/or parameters pertaining to loading unit 300. The parameter may include a serial number of a loading unit, a type of a loading unit, a size of a loading unit, a staple size, information identifying whether the loading unit has been fired, a length of a loading unit, and/or a maximum number of uses of a loading unit.

To selectively release loading unit 300 from adapter assembly 200, locking bar 240 is translated in a proximal direction, indicated by arrow “C” in FIG. 5B, toward the proximal/non-locking position, via movement of button 203 (see FIG. 1A) on knob housing 202. Upon locking bar 240 entering the proximal/non-locking position, ring member 244 of locking bar 240 disengages switch 220, which communicates to handle assembly 100 that loading unit 300 is no longer lockingly engaged with adapter assembly 200 and not ready for operation.

In the proximal/non-locking position, extension 252 of locking bar 240 is no longer blocking first lug 312 a of loading unit 300 and loading unit 300 can be rotated. Loading unit 300 is rotated, in a direction indicated by arrow “D” in FIG. 5B, to move first lug 312 a of loading unit 300 out of enclosure 284. The rotation of loading unit 300 also drives the rotation of annular member 260 from the second orientation to the first orientation via the mating engagement of second lug 312 b of loading unit 300 and second tab 268 b of annular member 260 (see FIG. 6B). As annular member 260 rotates from the second orientation to the first orientation, leaf spring 280 pivots, due to its resilient bias, from a deflected state (see FIG. 6B) to its non-deflected state (see FIG. 6A), in which first tab 268 a of annular member 260 is in engagement with extension 252 of locking bar 240 to maintain locking bar 240 in the proximal/non-locking position and out of engagement with switch 220.

To fully disengage loading unit 300 from adapter assembly 200, loading unit 300 is axially translated, in a distal direction, through distal cap 208, and out of elongated body 204 of adapter assembly 200. It is contemplated that upon handle assembly 100 detecting that loading unit 300 is not lockingly engaged to adapter assembly 200, power may be cut off from handle assembly 100, an alarm (e.g., audio and/or visual indication) may be issued, and combinations thereof.

While an electrical interface between loading unit 300, adapter assembly 200, and handle assembly 100 is shown and described, it is contemplated that any other form or communication is within the scope of the present disclosure, for transmitting any or all of the operating parameters and/or the life-cycle information from loading unit 300 to handle assembly 200, such as, for example, wireless communication, including various radio frequency protocols such as near field communication, radio frequency identification “RFID,” BLUETOOTH® (owned by Bluetooth SIG, Inc.), etc.

With reference to FIGS. 7A and 7B, an alternative embodiment of an adapter assembly 400, which is substantially similar to adapter assembly 200, is provided. Adapter assembly 400 includes an inner housing 414, similar to inner housing 214, an elongated member or locking bar 440, similar to locking bar 240, a switch 420, similar to switch 220, and an actuator board 490.

Inner housing 414 has a proximal end 416 disposed adjacent to a knob housing (not shown), similar to knob housing 202, and a distal end (not shown). Switch 220 is disposed within proximal end 416 of inner housing 414. Locking bar 440 includes a switch actuator or ring member 444, which is substantially similar to ring member 244 discussed above. Actuator board or tab 490 is attached to proximal end 416 of inner housing 414 and extends proximally therefrom to overlap switch 420. Actuator board 490 is configured to deflect into engagement with switch 420 upon a downwardly-oriented force being imparted thereon.

In operation, ring member 444 is translated from a proximal position, as shown in FIGS. 7A and 7B, to a distal position (not shown). In the proximal position, ring member 444 is out of engagement with actuator board 490, such that switch 420 is not actuated. In the distal position, ring member 444 overlaps actuator board 490 to deflect actuator board 490 into engagement with switch 420. As discussed above with reference to FIGS. 1A-6B and toggling of switch 220, upon a toggling of switch 420, handle assembly 100 detects that loading unit 300 is not lockingly engaged to adapter assembly 400.

With reference to FIGS. 8A and 8B, another alternative embodiment of an adapter assembly 500, which is substantially similar to adapter assembly 200, is provided. Adapter assembly 500 includes an inner housing 514, similar to inner housing 214, an elongated member or locking bar 540, similar to locking bar 240, a switch (not shown), similar to switch 220, and an actuator board 590.

Inner housing 514 has a proximal end 516 disposed adjacent to a knob housing (not shown), similar to knob housing 202, and a distal end (not shown). The switch is disposed within proximal end 516 of inner housing 514. Locking bar 540 includes a switch actuator or ring member 544, similar to ring member 244 discussed above. Actuator board or tab 590 is attached to proximal end 516 of inner housing 514 and extends proximally therefrom to overlap the switch. Actuator board 590 is pivotably connected to proximal end 516 of inner housing 514 via a pivot pin or rod 592.

In operation, ring member 544 is translated from a proximal position, as shown in FIGS. 8A and 8B, to a distal position (not shown). In the proximal position, ring member 544 is out of engagement with actuator board 590, such that the switch is not actuated. In the distal position, ring member 544 overlaps actuator board 590 to rotate actuator board 590 into engagement with the switch. As discussed above with reference to FIGS. 1A-6B, upon a toggling of the switch, handle assembly 100 detects that loading unit 300 is not lockingly engaged to adapter assembly 500.

It will be understood that various modifications may be made to the embodiments of the presently disclosed adapter assemblies. Therefore, the above description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present disclosure. 

The invention claimed is:
 1. A method of assembling a surgical instrument, the method comprising: coupling a surgical loading unit of the surgical instrument to a distal end portion of an adapter assembly of the surgical instrument; rotating an annular member of the adapter assembly out of a path of an elongated member of the adapter assembly; moving the elongated member of the adapter assembly in a distal direction to toggle a switch of the adapter assembly, wherein toggling the switch represents that the surgical loading unit is lockingly engaged with the adapter assembly; and abutting at least one appendage of the annular member against at least one protrusion of the surgical loading unit upon coupling the surgical loading unit to the adapter assembly, wherein rotating the annular member includes rotating the annular member relative to the elongated member from a first orientation, in which the at least one appendage is engaged to a distal end portion of the elongated member to maintain the elongated member in a proximal position, to a second orientation, in which the at least one appendage is disengaged from the distal end portion of the elongated member such that the elongated member moves to a distal position to toggle the switch.
 2. The method according to claim 1, further comprising decoupling the surgical loading unit from the adapter assembly, whereby the annular member rotates to the first orientation.
 3. The method according to claim 1, further comprising rotating the surgical loading unit relative to the adapter assembly, wherein rotating the surgical loading unit causes the annular member to rotate.
 4. The method according to claim 1, wherein the elongated member is resiliently biased toward the distal direction, such that the elongated member automatically moves in the distal direction to toggle the switch upon rotating the annular member out of the path of the elongated member.
 5. The method according to claim 1, further comprising communicating, when the switch is toggled, to a handle assembly of the surgical instrument at least one of an indicator that the surgical loading unit is lockingly engaged with the adapter assembly or at least one parameter pertaining to the surgical loading unit.
 6. The method according to claim 1, wherein when the elongated member is in the distal position, the at least one protrusion is captured between the at least one appendage and the distal end portion of the elongated member such that the surgical loading unit is lockingly engaged with the adapter assembly.
 7. A method of assembling a surgical instrument, the method comprising: inserting a surgical loading unit of the surgical instrument into a distal end portion of an adapter assembly of the surgical instrument; rotating the surgical loading unit relative to the adapter assembly, thereby rotating an annular member of the adapter assembly, against a resilient bias of a biasing member that is engaged to the annular member, out of a path of a locking bar of the adapter assembly; and toggling a switch of the adapter assembly upon rotating the annular member out of the path of the locking bar.
 8. The method according to claim 7, further comprising moving the locking bar in a distal direction, wherein moving the locking bar in the distal direction toggles the switch.
 9. The method according to claim 8, wherein the locking bar is resiliently biased toward the distal direction, such that the locking bar automatically moves in the distal direction to toggle the switch upon rotating the annular member out of the path of the locking bar.
 10. The method according to claim 7, wherein rotating the annular member includes rotating the annular member relative to the locking bar from a first orientation, in which the annular member prevents distal movement of the locking bar, to a second orientation, in which the locking bar moves distally to toggle the switch.
 11. The method according to claim 10, further comprising decoupling the surgical loading unit from the adapter assembly, whereby the annular member rotates to the first orientation.
 12. The method according to claim 11, wherein decoupling the surgical loading unit from the adapter assembly includes: rotating the surgical loading unit relative to the adapter assembly during which the biasing member transitions from a biased state to an unbiased state; and sliding the surgical loading unit distally out of from within the distal end portion of the adapter assembly.
 13. The method according to claim 7, further comprising communicating, when the switch is toggled, to a handle assembly of the surgical instrument at least one of an indicator that the surgical loading unit is coupled to the adapter assembly or at least one parameter pertaining to the surgical loading unit.
 14. The method according to claim 7, further comprising abutting at least one appendage of the annular member against at least one protrusion of the surgical loading unit upon inserting the surgical loading unit into the distal end portion of the adapter assembly.
 15. The method according to claim 14, wherein rotating the annular member includes rotating the annular member relative to the locking bar from a first orientation, in which the at least one appendage is engaged to a distal end portion of the locking bar to maintain the locking bar in a proximal position, to a second orientation, in which the at least one appendage is disengaged from the distal end portion of the locking bar such that the locking bar moves to a distal position to toggle the switch.
 16. The method according to claim 15, wherein when the locking bar is in the distal position, the at least one protrusion is captured between the at least one appendage and the distal end portion of the locking bar such that the surgical loading unit is lockingly engaged with the adapter assembly.
 17. The method according to claim 7, wherein inserting the surgical loading unit into the distal end portion of the adapter assembly includes axially translating the surgical loading unit into the distal end portion of the adapter assembly.
 18. The method according to claim 7, wherein the biasing member is a leaf spring that pivots, due to the rotation of the annular member, from a non-deflected state to a deflected state, wherein in the non-deflected state the leaf spring maintains the annular member in engagement with the locking bar to maintain the locking bar in a proximal position and out of engagement with the switch. 